Gulluggs have long, needle-like noses and fly around in circles. They are found on SR388 on the Surface and in Area 1. They frequently yield Missiles when killed. These creatures share the same eye style with the Yakuza in Metroid Fusion, suggesting that there may be some relation between the species. They resemble mosquito heads with bat wings.
In the game Metroid II: Return of Samus, Gulluggs can be seen constantly circling around a small area in the air. If Samus comes into contact with them, they can deal an extraordinary amount of damage, especially if she is hit more than once at the same time. Without the extra protection of the Varia Suit, they can cause a staggering 12 points of damage with one touch.
Gulluggs re-appear in Metroid: Samus Returns, now colored blue and capable of flying freely through the air. They are ubiquitous throughout the planet. Samus encounters a Gullugg on the Surface, where the game introduces the Melee Counter. Samus is encouraged to use it against an attacking Gullugg. Later variants of the Gullugg are colored magenta and capable of generating electrical energy, which cannot be countered.
"This creature flies around and around in the air."
- It is unknown if the Gullugg species was infected by the X Parasites, as Samus never encountered any Gullugg-X in Fusion.